16721712 has 120 divisors (see below), whose sum is σ = 54666144. Its totient is φ = 4672512.

The previous prime is 16721701. The next prime is 16721723. The reversal of 16721712 is 21712761.

It is an interprime number because it is at equal distance from previous prime (16721701) and next prime (16721723).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53268 + ... + 53580.

Almost surely, 2^16721712 is an apocalyptic number.

16721712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

16721712 is the 3339-th pentagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16721712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27333072).

16721712 is an abundant number, since it is smaller than the sum of its proper divisors (37944432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16721712 is a wasteful number, since it uses less digits than its factorization.

16721712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 378 counting only the distinct ones).

The product of its digits is 1176, while the sum is 27.

The square root of 16721712 is about 4089.2189963366. The cubic root of 16721712 is about 255.7173801644.

The spelling of 16721712 in words is "sixteen million, seven hundred twenty-one thousand, seven hundred twelve".